DTC Diagnosis Procedure
- DTC PRIORITY
If DTC P0139 or P0159 is detected with DTC P0137, P0138, P0157 or P0158, perform trouble diagnosis for DTC P0137, P0138, P0157 or P0158.
Is applicable DTC detected?
YES
Perform diagnosis of applicable. Refer to DTC Index .
NO
GO TO 2 .
- CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
- Clear the mixture ratio self-learning value. Refer to Description .
- Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine?
YES
Perform trouble diagnosis for DTC P0171, P0172, P0174 or P0175. Refer to DTC Logic or DTC Logic .
NO
GO TO 3 .
- CHECK HO2S2 GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
- Disconnect ECM harness connector.
- Check the continuity between HO2S2 harness connector and ECM harness connector.
DTC
+
-
Continuity
HO2S2
ECM
Bank
Connector
Terminal
Connector
Terminal
P0139
1
F13
4
F77
59
Existed
P0159
2
F12
4
- Also check harness for short to power.
Is the inspection result normal?
YES
GO TO 4 .
NO
Repair or replace error-detected parts.
- CHECK HO2S2 INPUT SIGNAL CIRCUIT
- Check the continuity between HO2S2 harness connector and ECM harness connector.
DTC
+
-
Continuity
HO2S2
ECM
Bank
Connector
Terminal
Connector
Terminal
P0139
1
F13
1
F77
57
Existed
P0159
2
F12
1
58
- Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and ground.
DTC
+
-
Continuity
HO2S2
Bank
Connector
Terminal
P0139
1
F13
1
Ground
Not existed
P0159
2
F12
1
DTC
+
-
Continuity
ECM
Bank
Connector
Terminal
P0139
1
F77
57
Ground
Not existed
P0159
2
58
- Also check harness for short to power.
Is the inspection result normal?
YES
GO TO 5 .
NO
Repair or replace error-detected parts.
- Check the continuity between HO2S2 harness connector and ECM harness connector.
- CHECK HEATED OXYGEN SENSOR 2
Check the heated oxygen sensor 2. Refer to Component Inspection .
Is the inspection result normal?
YES
Check intermittent incident. Refer to Intermittent Incident .
NO
GO TO 6 .
- REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to Exploded View .
CAUTION:- Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner [commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial service tool).
INSPECTION END